HUMAN DIGESTIVE SYSTEM

Published on: Author: Johny Thomas

The digestive system also known as the alimentary canal or gut is a long tube running from the mouth to the anus, with associated organs together with a number of associated glands that help in digestion. The human digestive system is well adapted for digestion and absorption. Digestion is the process by which insoluble, in… Continue reading

DIFFUSION, OSMOSIS,AND ACTIVE TRANSPORT

Published on: Author: Johny Thomas

DIFFUSION Diffusion is the movement of molecules from a region of high concentration to a region of low concentration down a concentration gradient until evenly distributed.Concentration gradient: the difference in concentration between two regions. Why does diffusion occur? 1. There is a great deal of empty space between molecules of all substances. (The spaces are… Continue reading

AIR POLLUTION BY GREEN HOUSE GASES (CARBON DIOXIDE AND METHANE) CONTRIBUTING TO GLOBAL WARMING.

Published on: Author: Johny Thomas

GLOBAL WARMING The atmosphere is trapping too much heat and causing the earth to heat up. This is known as GLOBAL WARMING. GREEN HOUSE GASES Carbon dioxide , Methane ,Nitrous oxide ,CFCs etc are called ‘green house gases’. These gases form a layer in the atmosphere and this layer acts like glass in the ‘green… Continue reading

EFFECT OF HUMAN ACTIVITY ON ECOSYSTEM

Published on: Author: Johny Thomas 1 Comment

Pollution Learning Objectives Describe the effects of man on the ecosystem with emphasis on the examples of international importance (Tropical rain forest, oceans, and important rivers) Describe the consequences of deforestation in terms of soil stability, climates and local human population. Evaluate the effects of: Water pollution by sewage, by inorganic waste and nitrogen containing… Continue reading